Ore-grinding



J. H. L. TUGK. Ore Grinding Mill.

No. 233,383. Patented Oct. 19,1880.

- i e A \E\\\ UNITED STATES PATENT OFFICE.

JOSIAH H. L. TUOK, OF SAN FRANCISCO, CALIFORNIA.

ORE-GRINDING.M|LL.

SPECIFICATION forming part of Letters Patent No. 233,383, dated October19, 1880.

Application filed January 19, 1880.

To all whom it may concern:

Be it known that I, JOSIAH H. L. TUGK, of the city and county of SanFrancisco, in the State of California, have invented certain new anduseful Improvements in Orushin g and Grinding Mills; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings.

My invention has reference to that class of mills for crushing andgrinding ores and other substances in which one or more rollers are madeto traverse in a circle around a fixed center, so as to crush and grindthe substance to be ground or pulverized between the rollers and thebed-plate upon which they travel.

My invention consists in a novel construction and arrangement of thebed-plate and the rollers with their shafts resting upon springs orelastic cushions in a ring, by which I provide a cheap, simple, andeffective ore-mill, all as hereinafter more fully described.

Referring to the accompanying drawings, Figure 1 is an elevation of myinvention with the bed-plate, outer rim, and distributing tub or hopperin vertical section. Fig. 2 is a plan view of the shafts with theirbevel grinding wheels or rollers and theoutersupporting-rim.

A is the bed-plate, which ordinarily I shall make stationary while therollers traverse around upon it; but the operation might be reversed, soas to rotate the bed-plate while the rollers remained stationary. Thelatter plan would be more expensive and not so convenient as the former.The upper surface of the bed-plate I make conical or tapering from itscenter to its periphery, and at proper distances apart I make two ormore concentric V-shaped grooves, 11, in its upper face, so that thegrooves will be at equal distances from each other between the centerand periphery. Around the outside rim of the circular bed-plate I securea vertical wire-gauze rim, 0, which extends high enough to form thedischarging-screen. Above the apex or center of the bed-plate I secure arotating head, D, by. means of a vertical spindle, e, which passes downthrough the center of the head and into or through the bed-plate, sothat the head can rotate freely on the spindle. In the present instancethis head is represented to be atub or vessel, with holes through itsbottom at different points, thus forming a convenient distributor forfeeding and distributing the ore or pulp upon the bed-plate, ashereinafter described.

G G G are horizontal shafts, the inner ends of which bear in the sidesof the rotating head or tub D, while their outer ends bear in a heavyring, H, which is somewhat larger than the circumference of thebed-plate. On each shaft G, I secure as many wheels, I, as there areV-shaped grooves in the bed-plate, and these wheels are graduated insize according to the pitch of the bed-plate, so that when the shaft ishorizontal each wheel will bearin its groove. The rims of these wheelsare made V-shaped to correspond with and fit into the V-shaped groovesin the bed-plate.

The V-rims of the wheels and the V-grooves in the bed-plate I will coverwith chilled-iron shoes, which can be removed and renewed as fast asthey wear out.

It will now be seen that the wheels I support the weight of the shaft Gand outside ring, H, and that neither wheel on any one shaft can belifted without lifting the weight of all the other wheels on the sameshaft and also the ring.

In the bearings, above the end of each shaft, I place an india-rubbercushion or spring, V, which. will allow the shaft to yield upward shouldone of the wheels move over any substance that the weight of the rollerswill not crush.

To drive these wheels power is applied to the ring H either by a belt,as represented in the present instance, or by forming cogs on the ringand driving it by means of a spurgear. When the ring is driven by a belta groove is made in its face, as shown, for the belt to run in.

When power is applied to drive the ring H the horizontal shafts G willbe carried around the center in a circle, and each shaft G will rotateindependently in its bearings in the head D and ring H, so that all thewheels on each shaft will rotate simultaneously, the smaller wheels nearthe center and the larger wheels near the periphery.

The ore and water or pulp are fed into the distributing-vessel D at thecenter of the conical bed-plate, and as this vessel is rotated slowlyThe action of the inner or small rollers is a crushing action, becauseof their slow motion and the greater crushing eti'ect which theirposition in the line of crushing-wheels gives them. Theshaftstlarelevers. their innerends, i

where they bear in the head 1), being the fulcrnm, while the ring andoutside wheels t'orm the weight, so that in order to raise the innerrollers the weight of the outside large rollers and the ring must alsobe raised. This gives the small rollers an extraordimiry crushingefl'ect. The outside rollers travel faster than the inside rollers, sothat they give the best grinding etl'ect. and thereby reduce the ore orpulp to great fineness.

The V shape of the grooves and rims ot the wheels is also an importantelement, as the particles are crushed by a rubbing aetion between theinclined faces of the. grooves and the inclined faces of the wheel -rim.The l grooves serve to concentrate the pulp in the t tracks of thewheels, so that; the action of the wheels is rendered very effective.This construction and arrangement provide a very simple and cheapore-mill, which posl sesses great capacity and will do thorough t work.I The sereeirrim might be omitted and some t other screening deviceemployed; but the i screen-rim is convenient and effective. l llavingthus described my invention, what I claim, and desire to secure byLetters Patent. is- I In an ore grinding and crushing mill, the tcombination, with the tapering concentricallyl grooved bed A. having thespindle c, with a t'eeding tub or hopper. l), of the radial shafts (L,having the unitormly-varyirig-sized stones or rollers [,and bearing-ringH, provided with springs V, under which the outer ends of the shaftsrest, suhstantiallyas and for the pur pose set forth.

In witness whereof I have hereunto set my hand and seal.

JOSIAH I]. L. TUCK. \Yitnesses:

JNO. IA. BooNE, Wu. F (LARIL

